This is a case for an inline boost converter, model xl6009. I am using it to drive a computer fan at 12v from a 5v USB battery pack.

This is the unit: https://www.amazon.com/dp/B01FDEWS7U/ref=asc_df_B01FDEWS7U5217429/?tag=hyprod-20&creative=395033&creativeASIN=B01FDEWS7U&linkCode=df0&hvadid=167146065113&hvpos=1o1&hvnetw=g&hvrand=6487775988747573151&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031923&hvtargid=pla-304542141486

Feel free to tweak here:
https://cad.onshape.com/documents/ffa97cded514a2eea93bd0dd/w/e7aabe1dbaeed8fae26974fc/e/cd4e5eef7fa3457f10869689